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gtestutils: pass open file descriptors to subprocess

Philip Withnall requested to merge pwithnall/glib:501-test-subprocess-fds into master

The subprocess needs to access the test_log_fd. If the file descriptors are not left open, functions such as g_test_message may stomp on file descriptors open by the subprocess and cause bad behavior of the test.

(Tweaked by Philip Withnall bugzilla@tecnocode.co.uk to fix review comments.)

This is an updated version of !501 (closed), with review comments resolved.

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